The MT-358 keeps this option open, by using the SIM card you insert, the FWT can transfer all incoming calls via its FXO port to GSM, and route the calls directly to your mobile using very cheap, if not free, mobile-to-mobile call rates or tariffs.

Many operators provide free unlimited minutes to mobiles on the same network for a cheap monthly rate, so if a SIM of the same network as your mobile is inserted into the device, these inclusive minutes can be used to route the call to your mobile, at no extra cost.

The device also works the other way around, and can route incoming GSM calls to a PSTN number over the analogue line.

Also, when a phone is connected via FXS, calls can be routed either by GSM or PSTN. The MT-358 can automatically check if the number dialed is on the network, and if this is the case, then the call will go out over the cheap GSM tariff (providing the user with 2 beeps to their handset to confirm); if not the call will go out over PSTN.

Key Features

• Auto-select most economic route - The MT-358 automatically routes calls out over GSM or PSTN, depending on the destination.
• 8 Channel - Up to 8 SIM cards allow for eight GSM channels to be active at a time.
• Polarity Reversing function
• Set GSM dial-out code amount
• Limit of communicating time
• GSM simulated echo-bell function
• Follow Me - PSTN to GSM and GSM to PSTN

Specification

• Phone impendance : Below DC 1kΩ，AC 600Ω。(not include line)
• Phone Ring Output Voltage : 45v rms
• Phone Signal (DTMF) Standard : -3dbm～-24dbm
• Phone Signal (DTMF)Time ： 50～100ms
• DTMF Frequency Rate Error ： ±1％
• Feeder Voltage ： 48v
• AC Adapter ： Input 110V AC, Output 12V DC 1A
• GSM Specification:
• GSM Frequency bands : Dual Band EGSM 900 and GSM 1800(GSM Phase 2+)
• GSM class : Small MS
• Transmit power :
• Class 4(2W) for EGSM 900
• Class 1(1W) for GSM 1800
• SIM card reader : External – connected via interface connector
• Antenna : 50 Ohm antenna coaxial connector
• Temperature range :
• Normal operation : -20℃ to +55℃
• Restricted operation : -25℃ to -20℃ and +55℃ to 70℃
• Storage : -40℃ to +85℃